Mandrel



l UNITED vSTAT ENTI ''foFFicE z l Y MANDRELV lJay Clair Moore, Fredonia,Pa. n L Application Janar'ys,1951,.seria.1N0.204,643

' This invention relates to the class of machine toolsand moreparticularly to an improved mandrel structure for grinding machines.- v

'-'An object of this invention is the provision o'i'a mandrelfstructurewhich isso` constituted as to provide forV variationin thickness ofdifferent grindingstones so as to maintain the front facerof the stoneat the'sane place. n .l

- Another object of this invention resides in the provision-of anovelsdesign Otmandrel which makes `theus'e of a combined nutand lockingflange so as to eliminate any member which may hinder the passing of awrench' jar or other tool past 'the end ofk themandrel. l'

I Still Yfurther objects of the invention reside in,

the provision'of a novel mandrel structure that isf-strong, durable,highly'eificient in operation, simple in construction andlmanufacture,lformed from a; minimum number ofv parts, and which is adapted for easyand simple removal and replacement of grinding stones.

These, `together with/the' various ancillary cio-1v jects of theinvention which will becomeapparl ent as the following descriptionproceeds, are attained by this mandrel structure, a preferred embodimentof which has been illustrated in the accompanying drawings, by way ofexample only, wherein:

Figure 1 is an exploded sectional view of the invention;

Figure 2 is a sectional view showing the mandrel structure in itsassembled relationship; and,

Figure 3 is an end elevational view of the invention. Y

With continuing reference to the accompanying drawings wherein likereference numerals designate similar parts throughout the various views,reference numeral I generally designates the mandrel structurecomprising the present invention which includes a spindle I2 adapted tobe rotated, which spindle has a threaded portion I4 which is left-handthreaded. An extension I6 is integrally formed with the spindle I2 andis right-hand threaded.

Threadedly secured on the spindle I2 is a nut I8 which is adapted toabut against a supporting flange generally indicated at 2U, whichconsists of a disk 22 having an outer annular flange 24. Thesupportinglange 20 is positioned on the spindle I2.

The grinding stone 26 may be any suitable emery wheel, sandstone wheel,or the like, provided with a central aperture 28. The grindstone 26 isprovided with a sharpened periphery as at 30. This grindstone isslidably placeable ,f4 anims. (ci. ,5r-Lissy upongthe cylindricalportion32 of the combined lockingV nutand `flange. membergenerallyriindlcatedat -34 which includes a disk3liV integrallyfformedrrwith' the cylindrical vportion 32,'-which disklirsffprovidedwithan outer ange 38 at its periphery'. The grinding stone may extendonto the threaded portion I4 of the mandrel I2 .when the. thickness ofthe stoneis greater than the spaceZ. Accordingly,` any thickness ofstandard stone may be usedvwithout any change inthe i'ange 34. Suitablespan arrangedfholes or aperl turesllil are formed in the. disk3 lforaidingl the vrenloving or replacement of the vmember `threadedengagement on theextension I6. It is to be noted that the extension I6is ofless diameter than the rest ofY the spindle I2 and hence-forms ashoulder generally indicated at 42.

When placing the grinding stone on the spin.

dle the nut ill is backed off and the supporting.

flangeI 26 is also backedY off to enable. the stone to be readily/placedon the spindle. Then, the stone'y having been placed on the cylindricalpor' tion of the member 34, the member 34 is threadedly secured on theextension I6 untilthe cylindrical portion32 abnts against the Vshoulder42.'V Ihen,v the stone is forced out against the` outside flange 38 bythe nut I8 urging the member 2U against the stone with the flange 24 inintimate engagement therewith.

To remove the grinding stone, it is first necessary to loosen the nutI8. The member 34 should not be loosened until the nut I8 is firstloosened.

Since the variation for thickness of the stone 2B is taken care of bythe nut I8, then the front face of the stone will always be in the sameposition. f

Since, from the foregoing, the construction and advantages of thismandrel structure are readily apparent, further description is believedto be unnecessary.

However, since numerous modifications will readily occur to thoseskilled in the art after a consideration of the foregoing specificationand accompanying drawings, it is not intended to limit the invention tothe precise embodiment shown and described, but also the modiiicationsand improvements may be readily resorted to which fall within the scopeof the appended claims. Y

Having described the claimed as new is:

1. A mandrel construction comprising a cylindrical spindle, said spindlehaving an extension attached thereto of smaller diameter than theinvention, what is Y 3 spindle forming a shoulder, said spindle beingleft-hand threaded, a nut threadedly secured on said spindle, asupporting flange member on said spindle, said extension beingright-hand threaded, a grinder stone having a central openingtherethrough, a locking member comprising a tubular internally threadedportion, and a disk integrally formed with said tubular portion, anannular flange formed on the periphery of the disk, said tubular portionbeing received in the opening in said grinder stone, said locking memberbeing threadedly secured on said extension in abutting engagement withsaid shoulder, said nut locking said supportingflange in engagement withsaid stone. said disk being held so that the annular ange thereonengages said grinder stone.

2. A mandrel construction comprising a cylindrical spindle, said spindlehaving an extension attached thereto `of smaller diameter than thespindle forming a shoulder, said spindle being left-hand threaded, a nutthreadedly secured on saidspindle, a supporting flange member on saidspindle, said extension being right-hand threadedjla grinder stonehaving a central opening therethrough, a locking member comprising atubular internally threaded portion, and a disk integrally formed withsaid tubular portion, an annular ange formed onthe periphery of thedisk, said tubular portion being received in the opening in said grinderstone, said locking member being threadedly secured on said extension inabutting engagement with said shoulder, said nut-locking said supportingflange in engagement with said stone, said disk being held so that theannular iiange thereon engages said grinder stone, said disk having apair of apertures therethrough for reception of a tool for selectivelyfastening and removing said locking member in engagement with saidgrinder stone.

3. A mandrel construction comprising a cylindrical spindle, said spindlehaving an extension attached thereto of smaller diameter than thespindle forming a shoulder, said spindle being left-hand threaded, a nutthreadedly secured on said spindle, a supporting flange member on saidspindle, said extension being right-hand thread- 4 ed, a grinder stonehaving a central opening therethrough, a locking member comprising atubular internally threaded portion, and a disk integrally formed withsaid tubular portion, an annular flange formed on the periphery of thedisk, said tubular portion being received in the opening in said grinderstone, said locking member being threadedly secured on said extension inabutting engagement with said shoulder, said nut locking said supportingange in engagement with said stone, said disk being held so that theannular flange thereon engages said grinder stone, said disk having apair of apertures therethrough for reception of a tool for selectivelyfastening and removing said locking member in engagement with saidgrinder stone, said supporting flange including a disk portion having anannular flange integrally formed therewith, said last recited annularange being held in engagement with said grinder stone.

4. AV mandrel'construction comprising a cylindrical spindle, saidspindle having an extensionv attached thereto oi smaller diameter thanthe spindle formingv a shoulder, said spindle being left-hand threaded,a nut threadedly secured on said spindle, a supporting flange member onsaid spindle, said extension being right-hand threaded, a grinder stonehaving a central opening therethrough, a locking member comprising atubular internally threadedportion, and a, Ydisk integrally formed withsaid tubular portion, an annular flange formed on the periphery of thedisk, said tubular portion being received in the opening in said grinderstone, said locking member being threadedly secured on said extension inabutting engagement with said shoulder, said. nut locking saidsupporting flange in engagement with said. stone, said disk being heldso that the annular ilange thereon engages said grinder stone"y saidsupporting ange including a disk portion having an annular flangeintegrally formed therewith, saidlast recited annular iiange being heldin engagement with said grinder stone.V

JAY CLAIR MOORE'.

No references cited.

